This file is indexed.

/usr/share/X11/xkb/compat/caps is in xkb-data 2.10.1-1ubuntu1.

This file is owned by root:root, with mode 0o644.

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partial xkb_compatibility "caps_lock"  {
    // Keysym Caps_Lock locks Lock modifier.
    // With this, the keysym Caps_Lock can be used without binding the whole
    // key to a real modifier.
	// This is essential when you don't want to use caps lock on the first
	// level.
	// This should not have any compatibility issues when used together with
	// other layouts which don't utilize this capability.
    interpret Caps_Lock {
        action = LockMods(modifiers = Lock);
    };
};